WinInet编程(学习)

 客户端从HTTP服务器下载相应的MP3文件的核心代码(HTTP中的GET方法):

#include <Windows.h>
#include <wininet.h>
#pragma comment(lib, "wininet.lib")
#define URL_STRING_TEST ""
void main()
{
    URL_COMPONENTS crackedURL;
    TCHAR szBuffer[1024];//这里是下载缓冲区大小 1KB大小缓冲写入一次
    TCHAR szHostName[128];
    TCHAR szUrlPath[256];
    ZeroMemory(&crackedURL, sizeof (URL_COMPONENTS));
    crackedURL.dwStructSize = sizeof (URL_COMPONENTS);
    crackedURL.lpszHostName = szHostName;
    crackedURL.dwHostNameLength = sizeof(szHostName);
    crackedURL.lpszUrlPath = szUrlPath;
    crackedURL.dwUrlPathLength = sizeof(szUrlPath);
    InternetCrackUrl(URL_STRING_TEST,(DWORD)strlen(URL_STRING_TEST),0,&crackedURL);
    FILE* file = fopen("Onelove.mp3", "wb");
    HINTERNET hInt,hConn,hReq;
    //启用HTTP协议
    hInt = InternetOpen("Microsoft Internet Explorer", INTERNET_OPEN_TYPE_DIRECT, NULL, NULL, 0);
    //建立HTTP连接
    hConn = InternetConnect(hInt,crackedURL.lpszHostName,crackedURL.nPort,NULL,NULL,INTERNET_SERVICE_HTTP,0,0);
    //创建一个URL请求
    hReq = HttpOpenRequest(hConn, "GET", crackedURL.lpszUrlPath, NULL, "", NULL, 0, 0);
    char buff[64];
    DWORD dwContLen = 0;
    DWORD dwLen;
    BOOL bResult = FALSE;
    DWORD nBytesGet = 0;
    BOOL bEnd = FALSE;
    DWORD dwRetCode = 0;
    DWORD dwSizeOfRq = sizeof(DWORD);
    dwSizeOfRq = sizeof(buff);
    if (HttpSendRequest(hReq,NULL,0,NULL,0)
        && HttpQueryInfo(hReq, HTTP_QUERY_STATUS_CODE|HTTP_QUERY_FLAG_NUMBER, &dwRetCode, &dwSizeOfRq, NULL)
        && dwRetCode < 400)
    {
        bResult = TRUE;//true;
    }
    //查询文件大小
    if (HttpQueryInfo(hReq, HTTP_QUERY_CONTENT_LENGTH, &buff, &dwSizeOfRq, NULL))
        dwContLen = atol(buff);
    INTERNET_BUFFERS BufferIn;
    BufferIn.dwStructSize = sizeof( INTERNET_BUFFERS ); // Must be set or error will occur

    BufferIn.Next = NULL;
    BufferIn.lpcszHeader = strHeader.c_str(); // 请求头

    BufferIn.dwHeadersLength = strHeader.length();
    BufferIn.dwHeadersTotal = 0;
    BufferIn.lpvBuffer = NULL;
    BufferIn.dwBufferLength = 0;
    BufferIn.dwBufferTotal = 1024; // This is the only member used other than dwStructSize

    BufferIn.dwOffsetLow = 0;
    BufferIn.dwOffsetHigh = 0;
    */
      hReq = HttpOpenRequest(hConn, "GET", crackedURL.lpszUrlPath, NULL, "", NULL, 0, 0);
    if (HttpSendRequest(hReq,NULL,0,NULL,0)
        && HttpQueryInfo(hReq, HTTP_QUERY_STATUS_CODE|HTTP_QUERY_FLAG_NUMBER, &dwRetCode, &dwSizeOfRq, NULL)
        && dwRetCode < 400)
    {
        bResult = TRUE;//true;
    }
    bool bTrue = HttpSendRequestExA(hReq,&BufferIn,NULL,NULL,0);
    while(TRUE)
    {
        if (bResult)
        {
            //开始读取文件
            bResult = InternetReadFile(hReq, szBuffer, sizeof(szBuffer), &dwLen);
            if (bResult)
            {
                cout<<"reading ... "<<(nBytesGet*100/dwContLen)<<endl;
                nBytesGet += dwLen;
                if (dwLen == 0)
                {
                    bEnd = TRUE;
                    break;
                }
                fwrite(szBuffer, 1, dwLen, file);
            }
        }
        else //数据接受完毕
        {
            break;
        }
    }
    fclose(file);
}

===================================================
POST方法上传数据(大量)

#include
#include
#include
BOOL UseHttpSendReqEx(HINTERNET hRequest, DWORD dwPostSize);
#define BUFFSIZE 500
void main( int argc, char **argv )
{
    DWORD dwPostSize;
    if (argc < 4)
    {
        printf("Usage: Bigpost \n");
        printf(" is the number of KB to POST\n");
        printf(" is the server to POST to\n");
        printf(" is the virtual path to POST to\n");
        exit(0);
    }
    if ( ((dwPostSize = strtoul(argv[1],NULL,10)) == 0) || (dwPostSize >=) )
    {
        printf("%s is invalid size. Valid sizes are from 1 to 2047999\n",[1]);
        exit(0);
    }
    printf( "Test of POSTing %luKB with WinInet\n", dwPostSize);
    dwPostSize *= 1024; // Convert KB to bytes
    HINTERNET hSession = InternetOpen( "HttpSendRequestEx",,
        NULL, NULL, 0);
    if(!hSession)
    {
        printf("Failed to open session\n");
        exit(0);
    }


    HINTERNET hConnect = InternetConnect(hSession, argv[2],,
        NULL, NULL, INTERNET_SERVICE_HTTP,NULL, NULL);
    if (!hConnect)
        printf( "Failed to connect\n" );
    else
    {
        HINTERNET hRequest = HttpOpenRequest(hConnect, "POST", argv[3],
            NULL, NULL, NULL, INTERNET_FLAG_NO_CACHE_WRITE, 0);
        if (!hRequest)
            printf( "Failed to open request handle\n" );
        else
        {
            if(UseHttpSendReqEx(hRequest, dwPostSize))
            {    
                char pcBuffer[BUFFSIZE];
                DWORD dwBytesRead;

                printf("\nThe following was returned by the server:\n");
                do
                {    dwBytesRead=0;
                    if(InternetReadFile(hRequest, pcBuffer, BUFFSIZE-1,&dwBytesRead))
                    {
                        pcBuffer[dwBytesRead]=0x00; // Null-terminate buffer

                        printf("%s", pcBuffer);
                    }
                    else
                        printf("\nInternetReadFile failed");
                }while(dwBytesRead>0);
                printf("\n");
            }
            if (!InternetCloseHandle(hRequest))
                printf( "Failed to close Request handle\n" );
        }
        if(!InternetCloseHandle(hConnect))
            printf("Failed to close Connect handle\n");
    }
    if( InternetCloseHandle( hSession ) == FALSE )
        printf( "Failed to close Session handle\n" );

    printf( "\nFinished.\n" );
}



BOOL UseHttpSendReqEx(HINTERNET hRequest, DWORD dwPostSize)
{
    INTERNET_BUFFERS BufferIn;
    DWORD dwBytesWritten;
    int n;
    BYTE pBuffer[1024];
    BOOL bRet;

    BufferIn.dwStructSize = sizeof( INTERNET_BUFFERS ); // Must be set or error will occur

    BufferIn.Next = NULL;
    BufferIn.lpcszHeader = NULL;
    BufferIn.dwHeadersLength = 0;
    BufferIn.dwHeadersTotal = 0;
    BufferIn.lpvBuffer = NULL;
    BufferIn.dwBufferLength = 0;
    BufferIn.dwBufferTotal = dwPostSize; // This is the only member used other than dwStructSize

    BufferIn.dwOffsetLow = 0;
    BufferIn.dwOffsetHigh = 0;

    if(!HttpSendRequestEx( hRequest, &BufferIn, NULL, 0, 0))
    {
        printf( "Error on HttpSendRequestEx %d\n",GetLastError() );
        return FALSE;
    }

    FillMemory(pBuffer, 1024, 'D'); // Fill buffer with data


    bRet=TRUE;
    for(n=1; n<=(int)dwPostSize/1024 && bRet; n++)
    {
        if(bRet=InternetWriteFile( hRequest, pBuffer, 1024, &dwBytesWritten))
            printf( "\r%d bytes sent.", n*1024);
    }
        
    if(!bRet)
    {
        printf( "\nError on InternetWriteFile %lu\n",GetLastError() );
        return FALSE;
    }

    if(!HttpEndRequest(hRequest, NULL, 0, 0))
    {
        printf( "Error on HttpEndRequest %lu \n", GetLastError());
        return FALSE;
    }

    return TRUE;
}
====================================================
HTTP服务器：
一般都是socket异步多线程(解析相应的HTTP协议，然后按照用户的命令(GET,POST,CGI))进行相应的处理
LAMP(Linux,apache,mysql,php)